Fix mac build.

Change-Id: I7229a628a619164eea22735bcaed507428ab054a
diff --git a/runtime/utils.cc b/runtime/utils.cc
index 98ccd8e..8083446 100644
--- a/runtime/utils.cc
+++ b/runtime/utils.cc
@@ -1174,7 +1174,7 @@
     }
   }
 #else
-  UNUSED(os, tid, prefix, current_method, current_code, ucontext_ptr);
+  UNUSED(os, tid, prefix, current_method, ucontext_ptr);
 #endif
 }